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I would use 2x4 framing with the 2x4's portioned on their edge. For the Planking I would use either a exterior grade plywood or painted interior plywood. You can attach to the walls on the back and the side (be sure to find and attach to the studs) the masonry side can use a leg or brace to the floor, or quality anchors could be used My fist recommendation is to go to the floor on that side